UNIDs during Perseid photo attempt

From: Björn Gimle (bjorn.gimle@gmail.com)
Date: Sat Aug 25 2012 - 16:51:40 UTC

  • Next message: ronlee@pcisys.net: "2012-044 A-C Obs, 18 August 2012 (time update"

    On the evenings of Aug 13 and 15 I was trying out my new camera
    (Panasonic Lumix DMC-GF2 with f=14mm/2.5 and f=45mm/1.8) for Perseid
    photography - saw just a few, but got none in the FOV while the camera
    was open.
    The first night I got 92-76B nicely passing Polaris in a wide-angle shot.
    
    On the 15th at 22:23:21 UTC I got the IGS 5 rk, within the start
    inside the field of the 45mm lens.
    
    At about 22:49:23 I was focusing on Altair with the 45mm lens to shoot
    the 12-44 objects, and discovered a bright satellite on the camera
    screen! Later, the image revealed the traces of Express MD2 and
    Globalstar M041: These two were within the FOV both at the start and
    end of the nominally 60s exposure (Marco: how do you determine the
    actual duration -and start- of the exposures?), but the bright UNID
    left the field too soon.
    
    In the exposure 22:53:17-22:54:22 (?) I captured the end of the 12-44C
    track, and the complete Cosmos 461.
    
    I saw a satellite entering the field before I pressed the button at
    23:28:06, and discovered a fainter one on the image later.
    The second one was in a ~92 deg NB or ~87 deg SB orbit?! The first one
    approximately in this orbit (if circular):
    1 90729U 12729A   12228.96409939  .00000125  00000-0  49463-4 0    08
    2 90729  97.7669 356.6329 0000010   0.0000 348.8380 14.29209232    01
    
    I have the images and some comments on my Facebook pages, in an album
    which supposedly is public, but I don't know how to publish a link to
    it, and I guess you have to be logged in to see it anyway.
    
    94729 12 729C   5919 E 20120815222922000 28 25 1951335+085641 37 S
    94729 12 729C   5919 E 20120815222950000 29 25 1929193+151467 37 S
    90729 12 729A   5919 E 20120815232808000 27 25 0149333+442792 37 R
    90729 12 729A   5919 E 20120815232848000 18 25 0212978+530541 68 R
    93729 12 729B   5919 E 20120815232530000 39 25 0326711+344290 37
    90729 12 729A   5919 E 20120815232908000 98 25 0341710+675415 37 R
    93729 12 729B   5919 E 20120815232530000 39 25 0449032+465241 37
    
    Large time uncertainties for the faint satellites, or when the end was
    outside the FOV.
    -- 
    ----------------------------------------
    Björn Gimle, COSPAR 5919
    59.2576 N, 18.6172 E, 23 m
    Phone: +46 (0)8 571 43 312
    Mobile: +46 (0) 704 385 486
    _______________________________________________
    Seesat-l mailing list
    http://mailman.satobs.org/mailman/listinfo/seesat-l
    



    This archive was generated by hypermail 2b29 : Sat Aug 25 2012 - 16:52:26 UTC